Surfacing-machine.



C. L. MATTISON.

SURFACING MACHINE. APPLICATION HLED' DEC-.21, 1914. 1,191,981. Patented'July 25, 1916.

2 SHEETSSHEET I.

ED STATES FATE our CARL LAWRENCE MATTISON, 0F BELOI'I, WISCONSIN,ASSIGNOR T0 0. -MATTISON MACHINE WORKS, OF BELOIT, WISCONSIN, ACORPQRATION OF WISCONSIN.

sUnr AcING-MAcHINE.

Specification of Letters Patent.

Patented July 25, 1916..

Application filed December 21, 1914. Serial No. 878,228.

This invention relates to a surfacing machine of the type generallyknown as a rubbing or polishing machine, since it isusually employed forrubbing the varnished surface of an article of furniture during theprocess of finishing such surface. The machine, however, is also adaptedfor sandpapering and other similar operations.

It is one of the objects of the present in vention to produce anextremely compact machine of this character and one which is shorter inlength than similar machinesheretofore known. I

Another object is to provide an improveddriving means for reciprocatingthe rubbing heads.

The invention also refers to improved guide means for the rubbing heads.

Another object of the invention is to provide improved means forpreventing the polishing material from splashing up onto the bearings ofthe driving mechanism or onto the guideways for the rubbing heads.

Further objects and advantages will appear from the following detaileddescription.

In the accompanying drawings, Figure l is a longitudinal verticalsectional view through a surfacing machine embodying the features of myinvention. Fig. 2 is a horizontal sectional plan view taken in the planeof line 2-2 of Fig. 1. Fig. 3 isa transverse vertical sectional view online 33 of Fig. 1, Fig. 4 is a fragmental transverse sectionillustrating the guide means for the rubbing heads.

The machine shown in the drawings, which represents the preferredembodiment of my invention, comprises an elongated' lower portion ofgenerally rectangular form and a circular upper portion disposed withits axis vertical and mounted on the middle of the lower portion. A pairof handles 9 fixed on opposite ends of the lower portion provide meansfor carrying the machine from place to place. The lower portioncomprises a rectangular base frame 10 open at its lower side, and a topmember 11 closlng the upper side of said frame and having a circularcentral portion 12. The upper part 13 constitutes the casing of anelectric motor, the lower side of the casing being open. Between thelower edge of the casing 13 and the upper edge of the central portion 12is a spider 14 having a central opening forming a bearing for thearmature shaft 15 of the motor. Below the spider 14 the said armatureshaft has teeth cut therein to upon pins or shafts 19 which are seatedin sockets 20 in a transverse web of the member lland have squared upperends 21 fitting into corresponding openings in the spider 14. 'The spurpinions 18 mesh with a central gear 22 which has :1, depending sleeve orhollow shaft 23 mounted in a ball bearing 24 in the member .11. Withinthe gear 22 is a bushing 25 which forms a bearing for the reduced lowerend of the armature shaft 15. The described gearing reduces the highspeed of the motor to a lower speed of the drive shaft or sleeve 23.

A double-throw crank-member 26, which may be of any suitableconstruction, has its upper end threaded into the lower end of thesleeve 23 and has its lower end rotatably mounted in a ball-bearing 27mounted on a cross-bar 28 which is suitably supported at its ends by therectangular base frame 10.

Pitmen 29 are connected to the opposite cranks of the crank-member 26,said pitmen extending in opposite directions from said member and beingattached at their other ends to pivot pins which are seated inupstanding bosses 31 on the rubbing heads 32. Preferably, ball bearings33 are provided at both ends of the pitmen 29.

'Each of the rubbing heads 32 is provided on its upper side with a pairof upwardly pointing wedge-shaped ribs 3-1 adapted to slide in guidegrooves 35 formed in the lower faces of inwardly extending ledges 36 onthe sides of the base frame 10. Vertical plates 43 are secured to theouter sides of the base frame and form dependin flanges which overlapthe sides of the rubbing heads as shown in Fig. 3. Below the ribs 34 theheads 32 are horizontally undercut orgrooved to receive supporting ribs37 which are formed on the inner sides of the .plates 43.

sides of the base frame 10. In the present 1 ary end plates 42 whichextend from side to finishing furniture,

against the bearings of the drive mechanism,

instance the plate 39 is flat and one of the flanges 38 lies above andthe other below said plate. At their outer sides the rubbing heads areslotted as at 40, and are provided with flanges 41 to cooperate withstationside of the base frame and completely close the open lower sidethereof at the ends. The plates 42 are. turned up to provide end flanges42? which in effect constitute a continuation of the end walls ofthebase frame.

The rubbin heads-32 fit snugly between the plates or anges 43 .atopposite sides of the base frame so that the lower side of said frame iscompletely closed at all times by the central plate 39, the rubbingheads 32, and the end plates 42. This prevents any of the polishingmaterial, commonly used in from splashing up or against the guidewaysfor the. rubbing heads.

The lower side of each rubbing head has beveled faces 44 extendingtransversely of the direction of reciprocation ofthe rubbing heads. Arubbing shoe 45 for'each head is provided with undercutgrooves 46 in astationary wall thereof and in a movable clampbar 47 to cooperate withthe beveled faces 44 on the rubbinghead. The clamp-bar 47 is adjustablysecured to the rubbing shoe by means of set screws 48. To the lowerfaces of the rubbing shoes are secured layers of' felt 49 orothersuitable material. If the machine is to be used for sand-papering,a sheet of sand-paper is attached to the lower side of each rubbingshoe.

It will be noted that when the rubbing heads are in their innermostposition, as

shown in Fig. l, the driving pitmen 29 overlap each other to aconsiderable extent, so that a very compact construction is afforded,and the rubbing heads can approach each other very closely. By providingthe central stationary splash-plate 39, the overlapping lnner' flanges38.can bemade much shorter so that the rubbing heads-may come closetogether, and the said stationary plate will close the gap between theflanges when the rubbing heads are in their outermost position, so as tokeep the lower side of the cas- 1ng constantly closed.

While I have herein described the preferred embodiment of my inventionin, con-' siderable detail, I do not thereby intend to limit theinvention to the form disclosed, ex-

cept'as recited in the appended claims.

I claim as my invention:

1. A surfacing machine having, in combi-' nation, a rectangular baseframe, a top member closing the upper side of said frame and having acentral circular chambered portion projecting upwardly, an electricmotor disposed with its-axis in a vertical plane and having its casingshaped to fit upon and be supported by the upper edge of said circularportion, the motor having an armature shaft projecting down into thecircular portion, a horizontal web extending across said circularportion and having bearings therein, reducing gearing supported incertain of said bearings and connected to said armature inv said web inalinement with the armature shaft and connected to said gearing to bedriven at a reduced speed by the latter, a pair of slidable rubbingheads mounted in said base frame, and means operatively connecting saidheads to said driving member.

2. In .a surfacing machine, in combination, a body having an open lowerside, a centrally positioned stationary member partially closing thesaid open side, and a pair of surfacing elements reciprocably mounted onthe body at opposite sides of said member and arranged to move towardand away from said member, said elements having parts cooperating withsaid stationary member to assist in closing said open side.

3. In a surfacing machine, in combination, a body having an open lowerside, a pair of surfacing elements reciprocably mounted atthe lower sideof the body,- a stationary horizontal plate mounted on the body betweensaid elements, and horizontal guard flanges on the surfacing elementsprojecting toward each other and lying one above and one below saidhorizontal plate to cooperate therewith in closing-the said open side ofthe body.

4. In a surfacing machine, in combination, a body having an open lowerside,

members fixed at opposite ends of the body and flanges adapted toslidably coact with said plates to assist in closing the said open side.

'6. In a surfacing achine, in combination, a body having an open lowerside, a pair of surfacing elements reciprocably mounted at the lowerside of the body, a stationary central. member and stationary endmembers arranged to partially close said lower side, and a pair ofsurfacing elements adapted to coact with said central member and endmembers, whereby to maintain said lower open side completely closed atall times.

7. In a surfacing machine, in combination, a body having an open lowerside, a

central horizontal plate and end horizontal plates partially closingsaid open side, and a pair of surfacing elements reciprocably. mountedadjacent to the open side and having horizontal flanges to slidablycoact with said horizontal plates, the inner flanges lying one above andone below the central plate.

8. In a surfacing machine, in combination, a body having an open lowerside, a centrally positioned stationary member adjacent to the lowerside, a pair of surfacing elements reciprocably associated with the bodyat opposite sides of said member, flanges on said elements extendingtoward each other and overlapping each other when the surfacing elementsare at their inner end of the stroke, the said member filling the gapbetween said flanges when thesurfacing elements are at the outer ends oftheir stroke. a

9. A surfacing machine comprising an elongated rectangular base frame, atop member'closing the upper side thereof and having a central circularportion, an electric motor disposed with its axis in a vertical planeand mounted on said circular portion, a pair of slidable surfacingelements, and means within said base frame connecting the motor to saidsurfacing elements for reciprocating the latter. I

10. In a surfacing machine,- in combination, a rectangular base frame, atop member closing the upper sideof said frame and having a circularcentral upwardly projecting portion, an electric motor disposed with itsaxis vertical and comprising a casing having an open lower end restingupon the said circular central portion of the top member, reducinggearing mounted in said top member and driven by the motor, a pair ofslidable rubbing heads mounted in said base frame, and crank meansconnecting thereducing gearing to said rubbing heads for reciprocatingthe latter.

'11. In a surfacing machine. in combination, a base having membersprovided at their lower faces with downwardly opening V-shapeclguide-grooves, a pair of rubbing heads mounted -beneath the A base, apair of upwardly pointing wedge-shaped ribs mounted on opposite sides-of each of the rubbing heads, the latter being undercut or grooved atopposite sides, and rails engaging in said grooves forsupporting therubblng heads when the machine is lifted.

12. In a surfacing machine, in combination, a base having thereindownwardly facing V-shaped guide-grooves, a pair of rubbing headsmounted beneath the base frame, and upwardly pointing wedge-shaped ribson said rubbing heads adapted to slide in said V-shaped grooves in thebase.

13. In a surfacing machine, in combination, a rectangular baseframehaving inwardly extending ledges at opposite sides thereof, said ledgeshaving in the lower faces downwardly opening V-shaped guide- .grooves, apair of rubbing heads mounted beneath opposite ends of said base frameand each having a pair of upwardly pointing wedge-shaped ribs adapted toenter and slide 1 I ,in said guide-grooves, and means fixed on the baseframe and engaging in said heads for supporting the latter when themachine is lifted.-

v H. In a surfacing tion. a rectan ular base frame having inwardlyextendlng ledges running along opp'osite sides thereof, the said ledgeshaving in their lower faces downwardly opening V-shaped guide-grooves, apair of rubbing heads mounted beneath opposite ends of said frame, apair'of upwardly pointing wedgeshaped ribs on opposite sides of eachrub; bing head adapted to enter said guidegrooves, each of said headsbelng undercut or grooved at opposite sides, and a pair of rails fixedat the under side of said ledges 'machine, in combina and enteringthegrooves in the rubbing heads for supporting'the latter whenthe machineis lifted. v I

15. In a surfacing machine. in combination, a body having an open lowerside, a pair of surfacing elements mounted atsald lower side 'toreciprocate toward and away from each other, and means for maintainingsaid lower side closed against the entrance of material from below, saidmeans comprising a member stationarily mounted on the body between saidsurfaclng elements and parts moving with said surfacingelements andarranged to overlap said member.

In testimony whereof, I hereunto setmy hand in the presence of twowitnesses.

J. V. DOWNING, E. M. IRISH.

